[THIN] Re: Hyperthreading

  • From: Henry Sieff <hsieff@xxxxxxxxxxxx>
  • To: "'thin@xxxxxxxxxxxxx'" <thin@xxxxxxxxxxxxx>
  • Date: Fri, 1 Oct 2004 09:30:03 -0500

Win2K = off.
Win2k3 = on.


> -----Original Message-----
> From: thin-bounce@xxxxxxxxxxxxx [mailto:thin-bounce@xxxxxxxxxxxxx]On
> Behalf Of BRUTON, Malcolm, FM
> Sent: Friday, October 01, 2004 4:30 AM
> To: 'thin@xxxxxxxxxxxxx'
> Subject: [THIN] Re: Hyperthreading
> 
> 
> So after all the discussions and the reading all the docs 
> seem to say that
> it will work with Windows 2000.  Do most people turn if off 
> for win2K or
> leave it on?  Do people think it is a good practice to 
> disable for Win2K
> systems?  What about for win2003?  Turn it on???
> 
> Thanks
> Malcolm
> 
> -----Original Message-----
> From: thin-bounce@xxxxxxxxxxxxx 
> [mailto:thin-bounce@xxxxxxxxxxxxx] On Behalf
> Of Nick Smith
> Sent: 01 October 2004 09:06
> To: thin@xxxxxxxxxxxxx
> Subject: [THIN] Re: Hyperthreading
> 
> I have similar, but I'm inclined to think that it's just Sage, as I've
> had the same happen on a non-HT processor. Sage is a pig, I 
> hate it more
> and more.
> Nick 
> 
> -----Original Message-----
> From: Dogers [mailto:dogers@xxxxxxxxx] 
> Sent: 30 September 2004 23:33
> To: thin@xxxxxxxxxxxxx
> Subject: [THIN] Re: Hyperthreading
> 
> On Thu, 30 Sep 2004 12:18:07 -0400, Bernd Harzog
> <bernd.harzog@xxxxxxxxxxx> wrote:
> 
> > Well what we discovered is that when a process is running on one of
> the virtual CPU's (2 or 3) and goes rogue, it shuts down the whole
> server. So, if something uses 25% of CPU (all of CPU 2 or 3) 
> doing this
> on a virtual CPU on Windows 2000 somehow clogs up the entire 
> system. So,
> our recommendations were; 1) don't use hyperthreading on Windows 2000,
> and if you insist upon turning it on, don't use Affinity to assign any
> processes to the virtual CPU's (only assign processes to the physical
> ones).
> > 
> > I would be interested in knowing if anyone else has seen 
> anything like
> this. If you have, and you could share with the list that 
> would be most
> useful.
> 
> YES! This sounds exactly like what we get, but only on win2003!
> Specifically in Sage Line 50 - it has functions which chew up 25% of a
> CPU (cant remember right now which one though..!) and the whole server
> comes to its knees for all users until the functions are 
> stopped. I want
> to try and disable HT to test and see if its that thats actually doing
> it, but its our sole server, so is a little difficult :(
> 
> Andrew
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